Re: [Qemu-ppc] [PATCH v3 2/3] hmp: fix "dump-quest-memory" segfault (arm)

[Greg Kurz]

On Tue, 12 Sep 2017 16:01:48 +0200
Laurent Vivier <address@hidden> wrote:

> Running QEMU with
>     qemu-system-aarch64 -M none -nographic -m 256
> and executing
>     dump-guest-memory /dev/null 0 8192
> results in segfault
> 
> Fix by checking if we have CPU, and exit with
> error if there is no CPU:
> 
>     (qemu) dump-guest-memory /dev/null
>     this feature or command is not currently supported
> 
> Signed-off-by: Laurent Vivier <address@hidden>
> ---

Reviewed-by: Greg Kurz <address@hidden>

>  target/arm/arch_dump.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/target/arm/arch_dump.c b/target/arm/arch_dump.c
> index 1a9861f69b..9e5b2fb31c 100644
> --- a/target/arm/arch_dump.c
> +++ b/target/arm/arch_dump.c
> @@ -273,11 +273,18 @@ int arm_cpu_write_elf32_note(WriteCoreDumpFunction f, 
> CPUState *cs,
>  int cpu_get_dump_info(ArchDumpInfo *info,
>                        const GuestPhysBlockList *guest_phys_blocks)
>  {
> -    ARMCPU *cpu = ARM_CPU(first_cpu);
> -    CPUARMState *env = &cpu->env;
> +    ARMCPU *cpu;
> +    CPUARMState *env;
>      GuestPhysBlock *block;
>      hwaddr lowest_addr = ULLONG_MAX;
>  
> +    if (first_cpu == NULL) {
> +        return -1;
> +    }
> +
> +    cpu = ARM_CPU(first_cpu);
> +    env = &cpu->env;
> +
>      /* Take a best guess at the phys_base. If we get it wrong then crash
>       * will need '--machdep phys_offset=<phys-offset>' added to its command
>       * line, which isn't any worse than assuming we can use zero, but being

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